You can download the M-Tool app for free in the Google Play store and in the Apple store.
You can download the manual for the app version of M-Tool here.
You can find the web-based version here: https://m-tool.awi.uni-heidelberg.de/
You can download the manual for the web-based version here.
The data generated with the M-Tool apps can be downloaded to the local device only. No third parties (nor the creators) have access to this data.
The data created with the web-based version is encrypted and stored on a server in compliance with GDPR regulations. No third parties have access to this data.